As far as I know, the memory check can't be turned off in the Memory Control Panel on a Quadra. I seem to recall that it requires a PPC and MacOS8 — possibly 8.5 or 8.6. It require…

The eMac 9.2.2 disc is a good one. The version I have has Mac OS ROM 10.1.1, which is one of the highest versions. I don't think any bootable, 9.2.2 install discs have the higher 1…

For the records: A 9.2.2 CD bundled with a later G4 worked quite well. It´s still verry strange to me, but the bought 9.1 refuses to boot, but a 9.2.2 works (even if it was made fo…

I've forgotten the difference between the 64K ROMs. It was something very minor to do with the ROM debugger IIR (we were hoping for a fix for >512K of RAM of course). Cli…

For the records: A 9.2.2 CD bundled with a later G4 worked quite well. It´s still verry strange to me, but the bought 9.1 refuses to boot, but a 9.2.2 works (even if it was made fo…

Your 9.1 CD is probably a few months older than your G4, and it lacks some driver needed to boot the Mac. Similarly, my new Mini came with Leopard, but it won't boot from a 10.5.0 …

Mr T, it's quite likely the motherboard in your Mac is the original, though upgraded to 512K. The original boards were shipped in 128Ks even after the Fat Mac 512K was introduced. …

So to be truly stock your ROMs should be 342-0220/1-A ©1983 variety, NOT 342-0220/1-B ©1984. Click to expand... Henry, since Beck-Tech read out the Apple ROMs to develop its me…

Don't you hold down some modifier key as you open the Memory control panel and it gives you that option? I remember something like that. Because really, RAM doesn't fail all that…

I like to know if one can determine by the label on the back of the macintosh case or better by the serial number what revision of the logic board has to be in it. The best would…

this is not my listing, i just don't have enough time to go get it this is the link: http://miami.craigslist.org/mdc/zip/1457218510.html looks great, but i just don't have the ti…

Carlo, since my HyperDrive 20 Mac is a Macintosh 512k with the "512k" label on back and with a stock Macintosh 512k board that has never been swapped out or upgraded, I am happy to…

I first wanted to hear from PB100 owners … Click to expand... Err what I posted about was expressly about a PB100, unless I'm wrong! JB Click to expand... Sure! I just …

Carlo (Mr.T), after reading your post again I see that you are expressing disappointment over not having a stock 128k. What I can say is that 128k logic boards are often sold on E…

For the records: A 9.2.2 CD bundled with a later G4 worked quite well. It´s still verry strange to me, but the bought 9.1 refuses to boot, but a 9.2.2 works (even if it was made f…

I first wanted to hear from PB100 owners … Click to expand... Err what I posted about was expressly about a PB100, unless I'm wrong! JB

Thanks for the answer! First though I'd reseat the RAM and rebuild everything. Then I'd do the old "clean the board with metho" or put in in a dishwasher, leave to dry for …

Beck-Tech's modified ROM was exactly the same as the original, except that in about a dozen places, Andy had hard-coded the screen address for 512KB of RAM, and those needed to be …

Carlo (Mr.T), after reading your post again I see that you are expressing disappointment over not having a stock 128k. What I can say is that 128k logic boards are often sold on E…

JDW, the pictures referred to show the decoder. Before there were little decoder boards made, people piggybacked an additional 7AS153 atop the one at F3 as in this photo: http://h…

(Are you speaking of the 7 holes shown in my photos between RP1 and C34? Click to expand... That is exactly right. There are many pictures on the forum of these mini-mux boards …

Here are my 128k logic board photos, which show top and bottom and many angles. Click on the individual photos, then click on the little "All Sizes" button above the photo to see …

I have a couple of early 128K boards; both are marked 820-0086-C in the top copper layer, and printed with a © 1983 date. Later 128K/512K boards do not need the little decoder boar…

Hi all, as this is my first posting i like to introduce myself a bit. I'm Carlo from Germany and I'm an longtime Apple user. I started with an Apple //c in 1990 and now I'm using…

Hmmm. The discussion about H2O2 makes me wonder what effect a solution of KNO3 would have... For that matter, given that the Oxi-whatever produces H2O2 can you just dispense with…